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(b)(4).During processing of this complaint, attempts were made to obtain complete event, patient and device information.Visual, dimensional and functional analysis was performed on the returned device.The reported inflation and deflation issue was not confirmed.A review of the lot history record identified no manufacturing nonconformities issued to the reported lot that would have contributed to this event.Additionally, a review of the complaint history revealed no other incidents.The investigation was unable to determine a conclusive cause for the reported inflation/deflation difficulty.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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